mirror of
https://github.com/python/cpython.git
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266 lines
9.1 KiB
Python
266 lines
9.1 KiB
Python
"""This module provides the components needed to build your own __import__
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function. Undocumented functions are obsolete.
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In most cases it is preferred you consider using the importlib module's
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functionality over this module.
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"""
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# (Probably) need to stay in _imp
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from _imp import (lock_held, acquire_lock, release_lock,
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load_dynamic, get_frozen_object, is_frozen_package,
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init_builtin, init_frozen, is_builtin, is_frozen,
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_fix_co_filename, extension_suffixes)
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# Could move out of _imp, but not worth the code
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from _imp import get_magic, get_tag
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from importlib._bootstrap import new_module
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from importlib._bootstrap import cache_from_source
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from importlib import _bootstrap
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from importlib import machinery
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import os
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import sys
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import tokenize
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import warnings
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# DEPRECATED
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SEARCH_ERROR = 0
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PY_SOURCE = 1
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PY_COMPILED = 2
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C_EXTENSION = 3
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PY_RESOURCE = 4
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PKG_DIRECTORY = 5
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C_BUILTIN = 6
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PY_FROZEN = 7
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PY_CODERESOURCE = 8
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IMP_HOOK = 9
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def get_suffixes():
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warnings.warn('imp.get_suffixes() is deprecated; use the constants '
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'defined on importlib.machinery instead',
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DeprecationWarning, 2)
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extensions = [(s, 'rb', C_EXTENSION) for s in extension_suffixes()]
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source = [(s, 'U', PY_SOURCE) for s in machinery.SOURCE_SUFFIXES]
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bytecode = [(s, 'rb', PY_COMPILED) for s in machinery.BYTECODE_SUFFIXES]
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return extensions + source + bytecode
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def source_from_cache(path):
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"""Given the path to a .pyc./.pyo file, return the path to its .py file.
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The .pyc/.pyo file does not need to exist; this simply returns the path to
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the .py file calculated to correspond to the .pyc/.pyo file. If path does
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not conform to PEP 3147 format, ValueError will be raised.
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"""
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head, pycache_filename = os.path.split(path)
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head, pycache = os.path.split(head)
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if pycache != _bootstrap._PYCACHE:
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raise ValueError('{} not bottom-level directory in '
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'{!r}'.format(_bootstrap._PYCACHE, path))
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if pycache_filename.count('.') != 2:
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raise ValueError('expected only 2 dots in '
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'{!r}'.format(pycache_filename))
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base_filename = pycache_filename.partition('.')[0]
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return os.path.join(head, base_filename + machinery.SOURCE_SUFFIXES[0])
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class NullImporter:
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"""Null import object."""
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def __init__(self, path):
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if path == '':
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raise ImportError('empty pathname', path='')
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elif os.path.isdir(path):
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raise ImportError('existing directory', path=path)
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def find_module(self, fullname):
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"""Always returns None."""
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return None
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class _HackedGetData:
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"""Compatibiilty support for 'file' arguments of various load_*()
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functions."""
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def __init__(self, fullname, path, file=None):
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super().__init__(fullname, path)
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self.file = file
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def get_data(self, path):
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"""Gross hack to contort loader to deal w/ load_*()'s bad API."""
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if self.file and path == self.path:
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with self.file:
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# Technically should be returning bytes, but
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# SourceLoader.get_code() just passed what is returned to
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# compile() which can handle str. And converting to bytes would
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# require figuring out the encoding to decode to and
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# tokenize.detect_encoding() only accepts bytes.
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return self.file.read()
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else:
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return super().get_data(path)
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class _LoadSourceCompatibility(_HackedGetData, _bootstrap.SourceFileLoader):
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"""Compatibility support for implementing load_source()."""
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def load_source(name, pathname, file=None):
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msg = ('imp.load_source() is deprecated; use '
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'importlib.machinery.SourceFileLoader(name, pathname).load_module()'
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' instead')
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warnings.warn(msg, DeprecationWarning, 2)
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return _LoadSourceCompatibility(name, pathname, file).load_module(name)
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class _LoadCompiledCompatibility(_HackedGetData,
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_bootstrap.SourcelessFileLoader):
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"""Compatibility support for implementing load_compiled()."""
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def load_compiled(name, pathname, file=None):
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msg = ('imp.load_compiled() is deprecated; use '
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'importlib.machinery.SourcelessFileLoader(name, pathname).'
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'load_module() instead ')
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warnings.warn(msg, DeprecationWarning, 2)
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return _LoadCompiledCompatibility(name, pathname, file).load_module(name)
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def load_package(name, path):
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msg = ('imp.load_package() is deprecated; use either '
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'importlib.machinery.SourceFileLoader() or '
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'importlib.machinery.SourcelessFileLoader() instead')
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warnings.warn(msg, DeprecationWarning, 2)
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if os.path.isdir(path):
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extensions = (machinery.SOURCE_SUFFIXES[:] +
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machinery.BYTECODE_SUFFIXES[:])
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for extension in extensions:
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path = os.path.join(path, '__init__'+extension)
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if os.path.exists(path):
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break
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else:
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raise ValueError('{!r} is not a package'.format(path))
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return _bootstrap.SourceFileLoader(name, path).load_module(name)
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def load_module(name, file, filename, details):
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"""**DEPRECATED**
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Load a module, given information returned by find_module().
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The module name must include the full package name, if any.
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"""
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suffix, mode, type_ = details
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with warnings.catch_warnings():
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warnings.simplefilter('ignore')
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if mode and (not mode.startswith(('r', 'U')) or '+' in mode):
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raise ValueError('invalid file open mode {!r}'.format(mode))
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elif file is None and type_ in {PY_SOURCE, PY_COMPILED}:
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msg = 'file object required for import (type code {})'.format(type_)
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raise ValueError(msg)
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elif type_ == PY_SOURCE:
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return load_source(name, filename, file)
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elif type_ == PY_COMPILED:
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return load_compiled(name, filename, file)
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elif type_ == PKG_DIRECTORY:
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return load_package(name, filename)
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elif type_ == C_BUILTIN:
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return init_builtin(name)
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elif type_ == PY_FROZEN:
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return init_frozen(name)
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else:
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msg = "Don't know how to import {} (type code {}".format(name, type_)
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raise ImportError(msg, name=name)
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def find_module(name, path=None):
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"""**DEPRECATED**
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Search for a module.
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If path is omitted or None, search for a built-in, frozen or special
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module and continue search in sys.path. The module name cannot
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contain '.'; to search for a submodule of a package, pass the
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submodule name and the package's __path__.
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"""
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if not isinstance(name, str):
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raise TypeError("'name' must be a str, not {}".format(type(name)))
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elif not isinstance(path, (type(None), list)):
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# Backwards-compatibility
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raise RuntimeError("'list' must be None or a list, "
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"not {}".format(type(name)))
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if path is None:
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if is_builtin(name):
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return None, None, ('', '', C_BUILTIN)
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elif is_frozen(name):
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return None, None, ('', '', PY_FROZEN)
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else:
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path = sys.path
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for entry in path:
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package_directory = os.path.join(entry, name)
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for suffix in ['.py', machinery.BYTECODE_SUFFIXES[0]]:
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package_file_name = '__init__' + suffix
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file_path = os.path.join(package_directory, package_file_name)
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if os.path.isfile(file_path):
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return None, package_directory, ('', '', PKG_DIRECTORY)
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with warnings.catch_warnings():
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warnings.simplefilter('ignore')
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for suffix, mode, type_ in get_suffixes():
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file_name = name + suffix
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file_path = os.path.join(entry, file_name)
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if os.path.isfile(file_path):
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break
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else:
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continue
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break # Break out of outer loop when breaking out of inner loop.
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else:
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raise ImportError('No module name {!r}'.format(name), name=name)
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encoding = None
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if mode == 'U':
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with open(file_path, 'rb') as file:
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encoding = tokenize.detect_encoding(file.readline)[0]
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file = open(file_path, mode, encoding=encoding)
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return file, file_path, (suffix, mode, type_)
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_RELOADING = {}
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def reload(module):
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"""Reload the module and return it.
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The module must have been successfully imported before.
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"""
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if not module or type(module) != type(sys):
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raise TypeError("reload() argument must be module")
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name = module.__name__
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if name not in sys.modules:
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msg = "module {} not in sys.modules"
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raise ImportError(msg.format(name), name=name)
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if name in _RELOADING:
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return _RELOADING[name]
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_RELOADING[name] = module
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try:
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parent_name = name.rpartition('.')[0]
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if parent_name and parent_name not in sys.modules:
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msg = "parent {!r} not in sys.modules"
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raise ImportError(msg.format(parentname), name=parent_name)
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return module.__loader__.load_module(name)
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finally:
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try:
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del _RELOADING[name]
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except KeyError:
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pass
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